Improvement in door-alarms



E. SPOOR & EL'PQSEARLE.

DO0R-ALARM.-

I No.170, 4'08.

Patented Nov. 23, 1875.

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DAVID E. SPOOR AND EDWARD P. SEARLE, OF MEDINA, NEW YORK.

IMPROVEMENT IN DOOR-ALARMS.

Specification formingpart of Letters Patent No. 170,408, dated November 23, 1875; application filed August 25,1875.

To all whom it may concern:

Be it known that we. DAvID E. SPooR and EDWARD P. SEARLE, of the town of Medina, in the county of Orleans, State of New York, have invented a new and useful Improvement in Door-Alarms, which improvement is fully set forth in the following specification, reference being had to the accompanying drawings.

The object of our invention is to attach to a door-frame one or more wires or strings, in the form of a piano-string, so that when the door is opened the strings are touched by nibs attached to the door, and made to vibrate and give the alarm required.

Figure 1 is an elevation, showing the inside of a door and frame, with a wire attached to the frame over the door. Fig. 2 is an elevation, showing the inside of a door and frame with the frame cut away so as to show a wire attached to the frame in a groove in the rabbet over the door. Fig. 3 is a section through A B, Fig. l and Fig. 2.

0, Fig.1, is a wire stretched across over the door, and kept in place by the stays D D, which are screwed to the door-frame. E, Fig.

1, is a nib screwed to the door, so that when the door is opened it touches the wire 0, and

causes it to vibrate. F, Fig.- 1, is a notch out in the door-frame. G, Fig. 2, is the groove in the rabbet of the door-frame, in which the wire H is placed and held by the pins I and J. K, Fig. 2, is a pin driven into the top of the door, so that when the door is opened the pin K touches the wire H and causes it to vibrate. The pin K passes through the notch F, Fig. 1, when the door is opened or shut.

Now, when the door is opened, the nib E, Fig. 1, touching the wire 0, and the pin K, Fig. 2, touching'the wire H, both wires are made to vibrate, and the alarm is given.

What we claim as our invention isv A wire or string alarm, arranged in such relation to the door as to be vibrated by a stud or projection thereon in the act of openin g or closing the door.

DAVID EMMORY SPOOR. EDWARD IAYSON SEARLE.

Witnesses HENRY A. Claims, EDWARD PossoN. 

